Suttner ST-2600 Car Wash Spray Guns 310 Bar 45 Lpm. The Suttner ST-2600 range of guns are based on the best selling ST-2300 guns, but with the added advantage of being fitted with the LTF (Low Triger Force) trigger system. The LTF system has a 90% less holding force and a 40% less trigger pulling force, than the standard market wash guns.